CN204290419U - A kind of charge protector and electronic product - Google Patents
A kind of charge protector and electronic product Download PDFInfo
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- CN204290419U CN204290419U CN201420839260.3U CN201420839260U CN204290419U CN 204290419 U CN204290419 U CN 204290419U CN 201420839260 U CN201420839260 U CN 201420839260U CN 204290419 U CN204290419 U CN 204290419U
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Abstract
The utility model discloses a kind of charge protector, comprise input interface, the first current-limiting resistance, output interface, the electric current that power supply provides flows through input interface, the first current-limiting resistance, output interface successively, flows into rechargeable battery through output interface, is rechargeable battery charging; Also comprise the second current-limiting resistance, the first switching tube and second switch pipe, one end of the second current-limiting resistance connects input interface, and the other end connects output interface by the switch ways of the first switching tube; One end of second switch pipe switch ways connects input interface, the other end ground connection of the switch ways of second switch pipe, and connects the control end of the first switching tube, and the control end of second switch pipe connects described output interface by bleeder circuit.The utility model also proposed a kind of electronic product adopting described charge protector to design.Charge protector of the present utility model avoids and overcharges rechargeable battery, improves the life-span of rechargeable battery; Charge protector is applied in electronic product, improves the useful life of electronic product.
Description
Technical field
The utility model belongs to circuit protection technical field, specifically, and the electronic product relating to a kind of charge protector and adopt described charge protector to design.
Background technology
At present, for electronic product, as MP3, bluetooth earphone etc., the charging circuit of a lot of producers design comes for battery charging by a diode and a current-limiting resistance exactly, this kind of design, and charging current remains unchanged in charging process, big current is charged to battery always, easily cause over-charging of battery and cause bulge, thus causing the Leakage Gas in battery even to explode, reducing the useful life of battery.
Summary of the invention
The utility model provides a kind of charge protector, solves the problem of over-charging of battery.
For solving the problems of the technologies described above, the utility model is achieved by the following technical solutions:
A kind of charge protector, comprise input interface, the first current-limiting resistance, output interface, the electric current that power supply provides flows through input interface, the first current-limiting resistance, output interface successively, flows into rechargeable battery through output interface, is rechargeable battery charging; Also comprise the second current-limiting resistance, the first switching tube and second switch pipe, one end of described second current-limiting resistance connects described input interface, and the other end connects described output interface by the switch ways of described first switching tube; One end of the switch ways of described second switch pipe is connected to described input interface, the other end ground connection of described second switch pipe switch ways, and connecting the control end of described first switching tube, the control end of described second switch pipe connects described output interface by bleeder circuit.
Further, described first switching tube is PMOS, and the source electrode of described first switching tube connects described second current-limiting resistance, and drain electrode connects described output interface, and grid connects the other end of described second switch pipe switch ways.
Further again, described first switching tube is PNP type triode, and the emitter of described first switching tube connects described second current-limiting resistance, and collector electrode connects described output interface, and base stage connects the other end of described second switch pipe switch ways.
Further, described second switch pipe is NPN type triode, and the collector electrode of described second switch pipe is connected to described input interface, and base stage connects described output interface by bleeder circuit, emitter by the 3rd current-limiting resistance ground connection, and connects the control end of described first switching tube.
Further, described second switch pipe is PMOS, and the drain electrode of described second switch pipe is connected to described input interface, and grid connects described output interface by bleeder circuit, and source electrode by the 3rd current-limiting resistance ground connection, and connects the control end of described first switching tube.
Further again, described bleeder circuit comprises the first divider resistance and the second divider resistance, one end of described first divider resistance connects described output interface, the other end of described first divider resistance connects one end of described second divider resistance, the other end ground connection of described second divider resistance, described first divider resistance is connected the control end of described second switch pipe with the intermediate node of the second divider resistance.
Further, the resistance of described first divider resistance is greater than the resistance of described second divider resistance, and the resistance of described first current-limiting resistance is greater than the resistance of described second current-limiting resistance.
Preferably, described input interface is USB interface.
Further, described input interface connects the first current-limiting resistance and the second current-limiting resistance respectively by diode, and one end of the switch ways of described second switch pipe is connected to described input interface by described diode.
Based on the structural design of above-mentioned charge protector, the utility model also proposed a kind of electronic product adopting described charge protector to design, comprise rechargeable battery and charge protector, described charge protector comprises input interface, the first current-limiting resistance, output interface, the electric current that power supply provides flows through input interface, the first current-limiting resistance, output interface successively, flowing into rechargeable battery through output interface, is rechargeable battery charging; Also comprise the second current-limiting resistance, the first switching tube and second switch pipe, one end of described second current-limiting resistance connects described input interface, and the other end connects described output interface by the switch ways of described first switching tube; One end of the switch ways of described second switch pipe is connected to described input interface, the other end ground connection of described second switch pipe switch ways, and connecting the control end of described first switching tube, the control end of described second switch pipe connects described output interface by bleeder circuit; Described output interface is connected with described rechargeable battery.
Compared with prior art, advantage of the present utility model and good effect are: charge protector of the present utility model utilizes the electronic component of pure hardware, low cost to build, and be arranged between charging inlet and battery, carry out charging detection and control without the need to microcontroller, just automatically can regulate charging process, avoid and rechargeable battery is overcharged, simplify the circuit design of electronic equipment, save board area, improve the life-span of rechargeable battery simultaneously, enhance charging safety; Described charge protector is applied in design of electronic products, improves the useful life of rechargeable battery in electronic product, then improve the useful life of electronic product.
After reading the detailed description of the utility model execution mode by reference to the accompanying drawings, other features of the present utility model and advantage will become clearly.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of the charge protector that the utility model proposes.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in more detail.
Embodiment one, the charge protector of the present embodiment is primarily of formations such as input interface, the first current-limiting resistance R1, the second current-limiting resistance R2, the first switching tube Q1, second switch pipe Q2, output interfaces, shown in Figure 1, one end of first current-limiting resistance R1 connects input interface, and the other end of the first current-limiting resistance R1 connects output interface; One end of second current-limiting resistance R2 connects input interface, and the other end of the second current-limiting resistance R2 connects one end of the first switching tube Q1 switch ways, and the other end of the first switching tube Q1 switch ways connects output interface; One end of the Q2 switch ways of second switch pipe connects input interface, the other end ground connection of second switch pipe Q2 switch ways, and connects the control end of the first switching tube Q1; The control end of second switch pipe Q2 connects output interface by bleeder circuit.
When the voltage (namely now cell voltage) of output interface is less than setting voltage, second switch pipe Q2 turns off, thus the first switching tube Q1 conducting, the electric current that power supply provides is divided into two-way after flowing through input port, one road electric current transfers to output interface by the first current-limiting resistance R1, another road electric current transfers to output interface by the switch ways of the second current-limiting resistance R2, the first switching tube Q1, and the electric current flowing through output interface flows into rechargeable battery BAT, for rechargeable battery BAT charges.
When the voltage (namely now cell voltage) of output interface is more than or equal to setting voltage, second switch pipe Q2 conducting, thus the first switching tube Q1 turns off, the electric current that power supply provides flows through input interface, the first current-limiting resistance R1, output interface, and transfer to rechargeable battery BAT through output interface, for battery BAT charges.
During due to the first switching tube Q1 conducting, the first current-limiting resistance R1 and the second current-limiting resistance R2 is in parallel, and the resistance after parallel connection is less than the resistance of the first current-limiting resistance R1, thus charging current is larger.That is, when the voltage of output interface is less than setting voltage, the first switching tube Q1 conducting, power supply is that rechargeable battery BAT charges by the first current-limiting resistance R1 and the second current-limiting resistance R2, and charging current is larger; When the voltage of output interface is more than or equal to setting voltage, the first switching tube Q1 turns off, and power supply is that rechargeable battery BAT charges by the first current-limiting resistance R1, and charging current is less.Therefore, charging process to rechargeable battery BAT: when cell voltage is less than setting voltage, large current charge, when cell voltage is more than or equal to setting voltage, low current charge, avoid and large current charge is adopted to rechargeable battery BAT always, and then avoid rechargeable battery BAT and overcharge, effectively improve the life-span of rechargeable battery BAT.
In the present embodiment, in order to ensure the correct flow direction of electric current, be also provided with diode D1 in circuit, input interface connects one end of switch ways of the first current-limiting resistance R1, the second current-limiting resistance R2, second switch pipe Q2 respectively by diode D1.
In the present embodiment, the voltage that power supply provides is 5V, and diode D1 conduction voltage drop is 0.3V, and the resistance of the first current-limiting resistance R1 is greater than the resistance of the second current-limiting resistance R2, and such as, the resistance of R1 is the resistance of 100 Ω, R2 is 2.2 Ω.When the first switching tube Q1 conducting, the first current-limiting resistance R1 and the second current-limiting resistance R2 is in parallel, and the resistance after parallel connection is (R1*R2)/(R1+R2) ≈ 2.15 Ω, and the charging current of charging for rechargeable battery BAT is (5-0.3)/2.15 ≈ 2.18A; When the first switching tube Q1 turns off, the charging current of charging for rechargeable battery BAT is (5-0.3)/100 ≈ 0.047A.Visible, charging current during the first switching tube Q1 conducting is greater than charging current when the first switching tube Q1 turns off.
In the present embodiment, first switching tube Q1 is preferably PMOS, second switch pipe Q2 is preferably NPN type triode, the source electrode of the first switching tube Q1 connects the second current-limiting resistance R2, drain electrode connects output interface, and grid connects the emitter of second switch pipe Q2, and the emitter of second switch pipe Q2 is by the 3rd current-limiting resistance R3 ground connection, the collector electrode of second switch pipe Q2 connects the negative electrode of diode D1, and the base stage of second switch pipe Q2 connects output interface by bleeder circuit.
Described divider resistance comprises the first divider resistance R4 and the second divider resistance R5, one end of first divider resistance R4 connects output interface, the other end of the first divider resistance R4 connects one end of the second divider resistance R5, the other end ground connection of the second divider resistance R5, the first divider resistance R4 is connected the control end of second switch pipe Q2 with the intermediate node of the second divider resistance R5.
Adjust the resistance of the first divider resistance R4 and the second divider resistance R5, make when the voltage of output interface is less than setting voltage, second switch pipe Q2 turns off; When the voltage of output interface is more than or equal to setting voltage, second switch pipe Q2 conducting.
In the present embodiment, magnitude of voltage during rechargeable battery BAT full capacity is 4.2V, and setting voltage elects 4.1V as, the resistance of the first divider resistance R4 is greater than the resistance of the second divider resistance R5, such as, the resistance of the first divider resistance R4 elects 5.1M Ω as, and the resistance of the second divider resistance R5 elects 1.1M Ω as.
When the voltage of output interface is less than 4.1V, through the dividing potential drop of R4 and R5, the voltage of R4 and R5 intermediate node is less than 0.7V, that is, the base voltage of second switch pipe Q2 is less than 0.7V, second switch pipe Q2 turns off, and the emitter voltage of second switch pipe Q2 is 0V, thus the grid voltage of the first switching tube Q1 is 0V, source voltage is 4.7V, therefore the first switching tube Q1 conducting, the first current-limiting resistance R1 and the second current-limiting resistance R2 is in parallel, and charging current is about 2.18A.
Along with the carrying out of charging to rechargeable battery BAT, the voltage of rechargeable battery BAT is increasing, that is, the voltage of output interface is increasing, when the voltage of output interface is more than or equal to 4.1V, through the dividing potential drop of R4 and R5, the voltage of R4 and R5 intermediate node is more than or equal to 0.7V, namely, the base voltage of second switch pipe Q2 is more than or equal to 0.7V, emitter voltage due to second switch pipe Q2 is 0V, second switch pipe Q2 saturation conduction, the collector voltage of second switch pipe Q2 is the voltage at diode D1 negative electrode place, i.e. 4.7V, the grid voltage of the first switching tube Q1 is also 4.7V, the grid voltage of the first switching tube Q1 is greater than source voltage, therefore the first switching tube Q1 turns off, charging current is about 0.047A.
Can find out, when cell voltage is lower than 4.1V, power supply is that rechargeable battery BAT charges by the first current-limiting resistance R1 and the second current-limiting resistance R2, charging current is 2.18A, when cell voltage is more than or equal to 4.1V, power supply is that rechargeable battery BAT charges by the first current-limiting resistance R1, and charging current is 0.047A.
In the present embodiment, input interface is preferably USB interface, is inserted into by input interface on the USB of power supply, namely can be rechargeable battery BAT and charges.By arranging USB interface, can be charged for rechargeable battery BAT by computer etc., improve the convenience of charging.
As the another kind of preferred design of the present embodiment, the first switching tube Q1 can also be chosen as PNP type triode, and the emitter of the first switching tube Q1 connects the second current-limiting resistance R2, and collector electrode connects output interface, and base stage connects the emitter of second switch pipe Q2.When second switch pipe Q2 turns off, the first switching tube Q1 conducting, power supply is that rechargeable battery BAT charges by the first current-limiting resistance R1 and the second current-limiting resistance R2; When the Q2 conducting of second switch pipe, the base voltage of the first switching tube Q1 is greater than emitter voltage, and the first switching tube Q1 turns off, and power supply is that rechargeable battery BAT charges by the first current-limiting resistance R1.Therefore, when the first switching tube Q1 elects PNP type triode as, also above-mentioned functions can be realized.
As the another kind of preferred design of the present embodiment, described second switch pipe Q2 also can select PMOS, the drain electrode of second switch pipe Q2 connects the negative electrode of diode D1, source electrode is by the 3rd current-limiting resistance R3 ground connection, and connecting the control end of the first switching tube Q1, grid connects output interface by bleeder circuit.Adjust the resistance of the first divider resistance R4 and the second divider resistance R5, make when the voltage of output interface is less than setting voltage, second switch pipe Q2 turns off; When the voltage of output interface is more than or equal to setting voltage, second switch pipe Q2 conducting.
The present embodiment also proposed a kind of electronic product, and electronic product comprises rechargeable battery and described charge protector, and the output interface of charge protector is connected with rechargeable battery, and power supply is rechargeable battery charging by charge protector.
Described electronic product is MP3, bluetooth earphone etc.
By arranging charge protector in electronic product, protecting the rechargeable battery in electronic product, avoiding rechargeable battery to overcharge, even battery explosion, then avoid electronic product due to battery explosion and cause damage; Owing to improve the useful life of rechargeable battery, then improve the useful life of electronic product.
Certainly; above-mentioned explanation is not to restriction of the present utility model; the utility model is also not limited in above-mentioned citing, the change that those skilled in the art make in essential scope of the present utility model, remodeling, interpolation or replacement, also should belong to protection range of the present utility model.
Claims (10)
1. a charge protector, comprises input interface, the first current-limiting resistance, output interface, and the electric current that power supply provides flows through input interface, the first current-limiting resistance, output interface successively, flows into rechargeable battery through output interface, is rechargeable battery charging; It is characterized in that: also comprise the second current-limiting resistance, the first switching tube and second switch pipe, one end of described second current-limiting resistance connects described input interface, and the other end connects described output interface by the switch ways of described first switching tube; One end of the switch ways of described second switch pipe is connected to described input interface, the other end ground connection of described second switch pipe switch ways, and connecting the control end of described first switching tube, the control end of described second switch pipe connects described output interface by bleeder circuit.
2. charge protector according to claim 1; it is characterized in that: described first switching tube is PMOS; the source electrode of described first switching tube connects described second current-limiting resistance, and drain electrode connects described output interface, and grid connects the other end of described second switch pipe switch ways.
3. charge protector according to claim 1; it is characterized in that: described first switching tube is PNP type triode; the emitter of described first switching tube connects described second current-limiting resistance; collector electrode connects described output interface, and base stage connects the other end of described second switch pipe switch ways.
4. the charge protector according to Claims 2 or 3; it is characterized in that: described second switch pipe is NPN type triode; the collector electrode of described second switch pipe is connected to described input interface; base stage connects described output interface by bleeder circuit; emitter by the 3rd current-limiting resistance ground connection, and connects the control end of described first switching tube.
5. the charge protector according to Claims 2 or 3; it is characterized in that: described second switch pipe is PMOS; the drain electrode of described second switch pipe is connected to described input interface; grid connects described output interface by bleeder circuit; source electrode by the 3rd current-limiting resistance ground connection, and connects the control end of described first switching tube.
6. charge protector according to claim 1; it is characterized in that: described bleeder circuit comprises the first divider resistance and the second divider resistance; one end of described first divider resistance connects described output interface; the other end of described first divider resistance connects one end of described second divider resistance; the other end ground connection of described second divider resistance, described first divider resistance is connected the control end of described second switch pipe with the intermediate node of the second divider resistance.
7. charge protector according to claim 6, is characterized in that: the resistance of described first divider resistance is greater than the resistance of described second divider resistance, and the resistance of described first current-limiting resistance is greater than the resistance of described second current-limiting resistance.
8. charge protector according to claim 1, is characterized in that: described input interface is USB interface.
9. charge protector according to claim 1; it is characterized in that: described input interface connects the first current-limiting resistance and the second current-limiting resistance respectively by diode, one end of the switch ways of described second switch pipe is connected to described input interface by described diode.
10. an electronic product, is characterized in that: comprise rechargeable battery and the charge protector any one of claim 1 to 9 as described in claim, and the output interface of described charge protector is connected with described rechargeable battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420839260.3U CN204290419U (en) | 2014-12-26 | 2014-12-26 | A kind of charge protector and electronic product |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420839260.3U CN204290419U (en) | 2014-12-26 | 2014-12-26 | A kind of charge protector and electronic product |
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| CN204290419U true CN204290419U (en) | 2015-04-22 |
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| CN201420839260.3U Expired - Fee Related CN204290419U (en) | 2014-12-26 | 2014-12-26 | A kind of charge protector and electronic product |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104410137A (en) * | 2014-12-26 | 2015-03-11 | 青岛歌尔声学科技有限公司 | Charging protection circuit and electronic product |
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2014
- 2014-12-26 CN CN201420839260.3U patent/CN204290419U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104410137A (en) * | 2014-12-26 | 2015-03-11 | 青岛歌尔声学科技有限公司 | Charging protection circuit and electronic product |
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Legal Events
| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150422 Termination date: 20211226 |